Participants in World War I
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This is a list of countries that participated in World War I, sorted by alphabetical order.
The Note: The Entente Forces are sometimes also referred to as the Entente Powers or Allies of World War I.
- Andorra
- First Republic of Armenia
- Belgium
- Brazil
- The British Empire[#endnote_BritishEmpire]
- * Australia
- * Canada
- * India (Now Bangladesh, India and Pakistan)
- * Newfoundland
- * New Zealand
- * South Africa
- * United Kingdom of Great Britain and Ireland
- China
- Costa Rica
- Czechoslovak Legions
- Cuba
- French Third Republic
- Greece
- Guatemala
- Haiti
- Honduras
- Italy
- Japan
- Liberia
- Luxembourg
- Montenegro
- Nicaragua
- Panama
- Portugal
- Romania
- The Russian Empire
- San Marino
- Serbia
- Siam (now Thailand)
- United States of America
The
Neutral states
Declarations of War
Allies and Central Powers, early August 1914
The following table shows the timeline of the several declarations of war [#endnote_decwars] among the belligerent powers.
| Date | Declarer | On |
|---|---|---|
| 1914 | ||
| July 28 | Austria-Hungary | Serbia |
| August 1 | Germany | Russia |
| August 3 | Germany | France |
| August 4 | United Kingdom | Germany |
| Germany | Belgium | |
| August 5 | Montenegro | Austria-Hungary |
| August 6 | Austria-Hungary | Russia |
| Serbia | Germany | |
| August 9 | Montenegro | Germany |
| August 11 | France | Austria-Hungary |
| August 12 | United Kingdom | Austria-Hungary |
| August 22 | Austria-Hungary | Belgium |
| August 23 | Japan | Germany |
| August 25 | Japan | Austria-Hungary |
| November 1 | Russia | Ottoman Empire |
| November 2 | Serbia | Ottoman Empire |
| November 3 | Montenegro | Ottoman Empire |
| November 5 | United Kingdom France | Ottoman Empire |
| 1915 | ||
| May 23 | Italy | Austria-Hungary |
| June 3 | San Marino | Austria-Hungary |
| August 21 | Italy | Ottoman Empire |
| October 14 | Bulgaria | Serbia |
| October 15 | United Kingdom Montenegro | Bulgaria |
| October 16 | France | Bulgaria |
| October 19 | Italy Russia | Bulgaria |
| 1916 | ||
| March 9 | Germany | Portugal |
| March 15 | Austria-Hungary | Portugal |
| August 27 | Romania | Austria-Hungary |
| Italy | Germany | |
| August 28 | Germany | Romania |
| August 30 | Ottoman Empire | Romania |
| November 1 | Bulgaria | Romania |
| 1917 | ||
| April 6 | United States | Germany |
| April 7 | Cuba | Germany |
| April 10 | Bulgaria | United States |
| April 13 | Bolivia | Germany |
| April 20 | Ottoman Empire | United States |
| July 2 | Greece | Germany Austria-Hungary Ottoman Empire Bulgaria |
| July 22 | Thailand | Germany Austria-Hungary |
| August 4 | Liberia | Germany |
| August 14 | China | Germany Austria-Hungary |
| October 6 | Peru | Germany |
| October 7 | Uruguay | Germany |
| October 26 | Brazil | Germany |
| December 7 | United States | Austria-Hungary |
| December 7 | Ecuador | Germany |
| December 10 | Panama | Austria-Hungary |
| December 16 | Cuba | Austria-Hungary |
| 1918 | ||
| April 23 | Guatemala | Germany |
| May 8 | Nicaragua | Germany Austria-Hungary |
| May 23 | Costa Rica | Germany |
| July 12 | Haiti | Germany |
| July 19 | Honduras | Germany |
| November 10 | Romania | Germany |
Notes
- ↑ The British Empire was the common term for the United Kingdom and its overseas possessions at this time. The term refers to the colonies it controlled, to India, which, while not officially designated a colony, was functionally indistinguishable from one, and the British Dominions - former colonies which were self-governing in most respects but whose foreign policy was controlled by London; Canada, Australia, Newfoundland, New Zealand and South Africa.
- ↑ Entries on a yellowish background refer to severed diplomatic relations only, not to actual declarations of war
See also
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